ช่วยทีคับ code search ผมต้องการให้ค้นหาจาฐานข้อมูลอ่ะคับ โดยใช้ list menu และ textbox

<? 
$objConnect = mysql_connect("127.0.0.1","root","1234") or die("Error Connect to Database");
$objDB = mysql_select_db("myfile");
mysql_query("set names utf8");
$strSQL = "SELECT * FROM filename where type = '".$_POST[selecttype]."' and keyword like '%{$key_search}%' ";
$objQuery = mysql_query($strSQL) or die ("Error Query [".$strSQL."]");
$Num_Rows = mysql_num_rows($objQuery);

$Per_Page = 5;   // Per Page

$Page = $_GET["Page"];
if(!$_GET["Page"])
{
	$Page=1;
}

$Prev_Page = $Page-1;
$Next_Page = $Page+1;

$Page_Start = (($Per_Page*$Page)-$Per_Page);
if($Num_Rows<=$Per_Page)
{
	$Num_Pages =1;
}
else if(($Num_Rows % $Per_Page)==0)
{
	$Num_Pages =($Num_Rows/$Per_Page) ;
}
else
{
	$Num_Pages =($Num_Rows/$Per_Page)+1;
	$Num_Pages = (int)$Num_Pages;
}

$strSQL .=" order  by ID ASC LIMIT $Page_Start , $Per_Page";
$objQuery  = mysql_query($strSQL);
?>
<table width="526" border="1">
  <tr>
    <th width="79"> <div align="center">ID </div></th>
    <th width="178"> <div align="center">FileName </div></th>
    <th width="82"> <div align="center">File Size</div></th>
    <th width="96"> <div align="center">keyword</div></th>
    <th width="57"> <div align="center">type</div></th>
  </tr>
<?
while($objResult = mysql_fetch_array($objQuery))
{
?>
  <tr>
    <td><div align="center"><?=$objResult["ID"];?></div></td>
    <td><?=$objResult["Fname"];?></td>
    <td><?=$objResult["Fsize"];?></td>
    <td><div align="center"><?=$objResult["keyword"];?></div></td>
    <td align="right"><?=$objResult["type"];?></td>
  </tr>
<?
}
?>
</table>

<br>
Total <?= $Num_Rows;?> Record : <?=$Num_Pages;?> Page :
<?
if($Prev_Page)
{
	echo " <a href='$_SERVER[SCRIPT_NAME]?Page=$Prev_Page'><< Back</a> ";
}

for($i=1; $i<=$Num_Pages; $i++){
	if($i != $Page)
	{
		echo "[ <a href='$_SERVER[SCRIPT_NAME]?Page=$i'>$i</a> ]";
	}
	else
	{
		echo "<b> $i </b>";
	}
}
if($Page!=$Num_Pages)
{
	echo " <a href ='$_SERVER[SCRIPT_NAME]?Page=$Next_Page'>Next>></a> ";
}
mysql_close($con);
?>